I think it may be “past climate of Earth seen in glaciers”/ I learned about this and that one doesn’t really ring a bell, plus it doesn’t make sense to me. I four sure know it’s not the fitting like a puzzle one. Sorry if I get this wrong.
Answer: 
Explanation:
Solubility product is defined as the equilibrium constant in which a solid ionic compound is dissolved to produce its ions in solution. It is represented as
The equation for the ionization of the
is given as:

When the solubility of
is S moles/liter, then the solubility of
will be S moles/liter and solubility of
will be 2S moles/liter.
By stoichiometry of the reaction:
1 mole of
gives 1 mole of
and 2 moles of 
![K_{sp}=[Ba^{2+}][F^{-}]^2](https://tex.z-dn.net/?f=K_%7Bsp%7D%3D%5BBa%5E%7B2%2B%7D%5D%5BF%5E%7B-%7D%5D%5E2)



Thus
for
is 
Answer:
pH = 1.683
Explanation:
plz mark as brainliest if it helps
All I know us the San Andreas fault line. That earthquake is far overdo